数字农科院2.0

Effects of vitamin A supplementation on growth performance, carcass characteristics and meat quality in Limosin x Luxi crossbreed steers fed a wheat straw-based diet

文献类型： 外文期刊

作者： Wang, W. J.;Wang, S. P.;Tan, Z. L.;Wang, S. P.;Wang, W. J.;Wang, S. P.;Gong, Y. S.;Wang, J. Q.

作者机构：

关键词： steers;vitamin A;meat quality;performance

期刊名称： MEAT SCIENCE

ISSN： 0309-1740

年卷期： 2007 年 77 卷 4 期

页码：

收录情况： SCI

摘要： Three experiments were conducted to examine the effects of dietary vitamin A supplementation on performance and carcass parameters in Limosin x Luxi crossbreed finishing steers fed a wheat straw-based diet. Sixteen 12-month old (301 +/- 22 kg) steers, 16 12-month old (309 +/- 15 kg) steers and 16 24-month old (411 +/- 20 kg) steers were used in experiment 1 for 6 months feeding period, in experiment 2 for three months feeding period and in experiment 3 for three months feeding period, respectively. Sixteen steers of each experiment were randomly divided into the four groups of four animals. Treatments consisted of four vitamin A supplementation levels (0, 1100, 2200 and 4400IU/kg DM). The growth rate was affected by dietary vitamin A level in experiment 1 and 2, revealing that the suitable amount of vitamin A supplementation increased the growth rate; excessive vitamin A in the ration decreased the growth rate of 12-month-old finishing steers. The marbling deposition decreased with the increment of vitamin A supplementation level, but possibly associated with vitamin A supplementing duration. Furthermore, the suitable dietary vitamin A level probably decreased lipid and pigment oxidation, and increased the tenderness of beef meat. Vitamin A supplementation had no significant effect on chemical composition of gluteus medius muscle and longissimus dorsi muscle. (C) 2007 Elsevier Ltd. All rights reserved.

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